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It is either 21 or 18. They have talked about lower the age to 18 but I am not sure if they did it yet or not.
Answer:
The correct answer is : 4 to 8 weeks
Explanation:
When it is about competing in athletic events, what is recommendable for athletes is to spend many hours practicing and perfecting their skills. these sessions to perform drills and improve the athlete's skills and conditions have to take at least 8 weeks to be fully trained for the contest.